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7.17 ATAN2 ¡ª Arctangent function


Description:
ATAN2(Y,X) computes the arctangent of the complex number X + i Y.
Option:
f95, gnu
Class:
elemental function
Syntax:
X = ATAN2(Y,X)
Arguments:
Y        The type shall be REAL(*).
X        The type and kind type parameter shall be the same as Y. If Y is zero, then X must be nonzero.


Return value:
The return value has the same type and kind type parameter as Y. It is the principle value of the complex number X + i Y. If X is nonzero, then it lies in the range -\pi \le \arccos (x) \leq \pi. The sign is positive if Y is positive. If Y is zero, then the return value is zero if X is positive and \pi if X is negative. Finally, if X is zero, then the magnitude of the result is \pi/2.
Example:
          program test_atan2
            real(4) :: x = 1.e0_4, y = 0.5e0_4
            x = atan2(y,x)
          end program test_atan2
     

Specific names:
Name        Argument        Return type        Option
DATAN2(X)        REAL(8) X        REAL(8)        f95, gnu
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